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TRB Special Report 304:How We Travel: A Sustainable National Program for Travel Data assesses the current state of travel data at the federal, state, and local levels and defines an achievable and sustainable travel data system that could support public and private transportation decision making. The committee that developed the report recommends the organization of a National Travel Data Program built on a core of essential passenger and freight travel data sponsored at the federal level and well integrated with travel data collected by states, metropolitan planning organizations, transit and other local agencies, and the private sector.